BULLETIN OF THE BUSSEY INSTITUTION. 69 
sand marl;” II., with 1200 grms. green sand and 40 grms. roasted 
sheepskin ; III., 1180 green sand and 40 roasted sole leather ; IV., 1100 
green sand and 35 simple sheepskin; V., 1200 green sand and 40 
simple sole leather; VI., 1160 green sand and7 sponge; VIL, 800 
green sand and 300 anthracite powder; VIII., 1100 green sand and 50 
air-dried peat from Bussey farm; and IX., 1250 grms. green sand alone. 
The roasted leathers were powdered and intimately mixed with the 
sand, as before, while the shreds of unroasted leather were spread in 
alternate layers with the sand. ‘Three buckwheat seeds were planted 
in each jar, February 15, 1875. Jars Nos. 1 to 8 were watered with 
rain-water throughout the experiment, but jar No. 9 was watered with 
a solution of nitrate of lime of the usual strength (1 grm. to the 
litre). The results of these experiments are given in the following 
table : — 
The crops harvested April 20, 1875. 
No. and contents of the jar. Weighed naw th Had 
grammes. height. seeds. 
Ty Green sand’alone;.. . «i « + ¢ « 0.085 
I. G. sand and roast sheepskin ns 0.085 
. sand and roast sole leather . . . 0.780 
. sand and simple sheepskin . . . 0.100 
. sand and simple sole leather. . . 0.115 
STEER UMN MONG os) elt se o's 0.060 
. sand and anthracite. ..... 0.110 
. sand and peat pa 0.445 
.sandand nitrate of lime .... 3.930 
* And many flowers. 
Here, as in the other experiments, the roasted sole leather mani- 
festly supplied some nitrogen to the crop. There seemed indeed to 
be a good deal of nitrogen at the disposal of the plants in that jar 
(No. 3), but it was especially noteworthy that the plants did not 
profit by it much until they had become rather old. Thus on the 13th 
March, almost a month after the seeds had been sown, the plants in 
jars Nos. 1 to 6 were all very poor, and on the 23d March, although 
jars Nos. 3, 7, and 8 were rather better than the rest, except 9, it was 
still true that there was not a jar in the green sand series, excepting 
No. 9, that had so good a crop as several that were growing close at 
hand in calcined loams from various sources, in which buckwheat seeds 
had been sown two days later than in the green sand, and which had 
been watered with rain-water without addition of any other substance. 
